Ericameria cooperi |
Ericameria discoidea |
|
---|---|---|
Cooper's goldenbush |
discoid goldenweed, rayless goldenbush, sharp-scale goldenweed, white-stem goldenbush |
|
Habit | Plants 10–40 cm. | |
Stems | erect to spreading, abundantly branched, twigs green when young, concealed by whitish, pannose tomentum, sporadically stipitate-glandular. |
|
Leaves | ascending to spreading; blades linear or oblong to oblanceolate (flat), 10–35 × 2–7 mm, midnerves evident (1–2 fainter, collateral nerves often present), (margins often undulate) apices acute to obtuse, usually apiculate, faces usually stipitate-glandular, resinous; axillary fascicles absent. |
|
Peduncles | 3–15 mm (bracts 0–3, reduced, leaflike, whitish tomentose and usually stipitate-glandular). |
|
Involucres | obconic, 9–13 × 6–10 mm. |
|
Ray florets | 0. |
|
Disc florets | 10–26; corollas 9–11 mm. |
|
Phyllaries | 12–17 in 2–3 series, green to tan, lanceolate to oblong, 6–10 × 1–2 mm, subequal, outer herbaceous or distally so, inner mostly chartaceous, midnerves evident, (margins of outer often distally stipitate-glandular, of inner narrowly membranous, sometimes minutely ciliolate) apices acute to attenuate, abaxial faces stipitate-glandular. |
|
Heads | borne singly or in cymiform to racemiform arrays. |
|
Cypselae | brownish, narrowly oblong to narrowly ovoid, 5–6 mm, villous; pappi tan, 8.5–11 mm. |
|
2n | = 18. |
|
Ericameria cooperi |
Ericameria discoidea |
|
Phenology | Flowering late summer–fall. | |
Habitat | Rocky, open or sparsely wooded slopes, often in coarse talus | |
Elevation | 2500–3800 m (8200–12500 ft) | |
Distribution |
CA; NV; nw Mexico
|
CA; CO; ID; MT; NV; OR; UT
|
Discussion | Varieties 2 (1 in the flora). Ericameria cooperi var. bajacalifornica (Urbatsch & Wussow) Urbatsch is known only from Mexico (Baja California). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Ericameria discoidea is common in the Rocky Mountains. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 56. | FNA vol. 20, p. 58. |
Parent taxa | Asteraceae > tribe Astereae > Ericameria | Asteraceae > tribe Astereae > Ericameria |
Sibling taxa | ||
Subordinate taxa | ||
Synonyms | Bigelowia cooperi, Haplopappus cooperi | Macronema discoidea, Haplopappus macronema |
Name authority | (A. Gray) H. M. Hall: Univ. Calif. Publ. Bot. 3: 56. (1907) | (Nuttall) G. L. Nesom: Phytologia 68: 153. (1990) |
Web links |